<template>
  <div class="login_container">
    <div class="login_box">
      <!--      头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!--      登录表单-->
      <el-form ref="loginFormRef" class="login_form" :model="loginForm" :rules="loginFormRules" label-width="0px">
        <!--        用户名-->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!--        密码-->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" type="password" prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!--        按钮-->
        <el-form-item class="btns">
          <el-button @click="login" type="primary">登录</el-button>
          <el-button @click="resetLoginForm" type="info">重置</el-button>
        </el-form-item>

      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    data () {
      return {
        //这是登录表单的数据绑定对象
        loginForm: {
          username: 'admin',
          password: '123456'
        },
        //  这是表单的验证规则对象
        loginFormRules: {
          username: [{
            required: true,
            message: '请输入登录名称',
            trigger: 'blur'
          },
            {
              min: 3,
              max: 10,
              message: '长度在3到10之间',
              trigger: 'blur'
            }],
          password: [{
            required: true,
            message: '请输入登录密码',
            trigger: 'blur'
          }, {
            min: 6,
            max: 15,
            message: '长度在6到15之间',
            trigger: 'blur'
          }]
        }
      }
    },
    methods: {
      //点击重置按钮
      resetLoginForm () {
        this.$refs.loginFormRef.resetFields()
      },
      //登录按钮
      login () {
        this.$refs.loginFormRef.validate(async (valid) => {
          if (!valid) return
          const { data: res } = await this.$http.post('login', this.loginForm)
          if (res.meta.status !== 200) return this.$message.error('登录失败')
          this.$message.success('登陆成功')
          // 登陆成功之后的行为
          // 1、将登陆成功之后的token，保存到客户端的sessionStorage中
          //    1.1、项目中出现除登录以外的其他API接口，必须在登陆之后才能询问
          //    1.2、token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
          window.sessionStorage.setItem('token', res.data.token)
          // 2、通过编程式导航跳转到后台主页路由地址是/home
          this.$router.push('/home')
        })
      }
    }
  }
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;

  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;

      img {
        height: 100%;
        width: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
</style>
